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    <title>Document</title>
    <script>
        // 利用函数冒泡排序 sort 排序
        function sort(arr){
            for(var i = 0; i < arr.length - 1; i++){
                for(var j = 0; j < arr.length - i - 1; j++){
                    if(arr[j] > arr[j + 1]){
                        var num = arr[j];
                        arr[j] = arr[j + 1];
                        arr[j + 1] = num;
                    }
                }
            }
            return arr;
        }
        var arr1 =  sort([5,2,1,4,3]);
        console.log(arr1);
    </script>
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